Library not loaded error after brew install php56

Question

I\'m upgrading from php5.5 to php5.6 on OSX Mavericks using homebrew. I run

brew install php56

Everything runs and completes fine but when

Answer 1

previous solution was not working:

$ php -i
dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.55.dylib
  Referenced from: /usr/local/bin/php
  Reason: image not found
Trace/BPT trap: 5

solved with:

$ brew update && brew upgrade icu4c

see https://github.com/Homebrew/homebrew-php/issues/1701